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EUGEN BARON BITTER & CHARLES KELLNER. PROCESS OPIMANUFAGTURING'GBLLULOSE- OR PAPER PULP PROM WOOD PIBER- V 7 No. 329,215. Patented Oct. 27,1885..

L/z B & Q

:20AM CAI ATTORNEYS -,The details'of our'process admit of several: l variations-without departure-from the spirit:

UNiTnngSrAIss? .rrio E PATENT 'fAU'sTRI -HUNGARY; ASSIGNORS "To WILLIAM n1, nussnnn'rnnsrnnfoni AW EN ,Mnsssonnsnrrs;

- Emperor of Austria-s Wood. Fiber GZJZ LQ-and in Austria-.Hungary August-2,

, or its eqniyalent upon the fiber; and thefin-' and exact description of :the inventiomlrefer i wertical stationary boilersfcontainingithe disiintegrating-solutiomland prior to' eachheat-' ipgsulphuron's acid is forced in until .a pressure "rtn'crsspsmfinmcrum-ss nflreiosteswearers-men answeraspncrrrcn'rxon as;

shatters mime No. 329,215, dated Qictobera7jiee5 1 Application filed January 131 1 885. Serial No. 152,755 (No speoimensli Patented in Austria-HungaryAngust 2,1883, No;'20,0,24 and.

No. 31,730 in'Fmnce September'27,'1883, ;$o5 151,154 Belgium Septomher 29,1883, yo, 625746,;nnd in Italy January 22 1884 To all whom it ieozmeflt: I Be it known that-swa Ens gn, -BARON-BIT--- TERand CHARLEfi-KER R ,;subjeets of theany, sresiding atstmaiHungary, -have useful-]?rooe sses;.of'

t r r B fwm V eutioni havingbee'n 'p tented/t0 us. in.,l taly nary 22,1884; 11611 4 i Fr ,5 item-21. 8 e 157,754 a in- Belgium fiep ember 29,1883, 'Noe Podgo'ra, near Goe'ra invented certain he Manufacturing Gellulo (thesa'i '1885,N *QY20,021 and Ncr. l,?30,)and we do hereby declare the following to-bba-full, clear enoe'being-hadto the'accompanyingdrawing which forms apart oi this speciiieationi This invention has relation'to themannfac;

fiber'by theaction ofsulphurons-acid#so1ution;

veutionfconsists 'inanovel process whereby the disaggregation and bleaching-of the fibrous. material constitutes a. single continuous operration. (Y r of the invention} Thus, for instance, accord-1 ingto onemethod of'carrying our pro'cessiinto efi'ect,-woods from which white and strong cellulose is to be inanufacturedare soakedin ,o fqat least two atm'ospheres has been" created, "when either 'pnre steam or steam mixed with sulphurous acid is admitted and maintained for a long time at a temperature exceeding the boiling-point of watento'beultimately brought to a temperature corresponding to apressure of, steam amounting to three to fi-ve atmospheres. Theprocess thusoonducted is disaggregation' in its first stage, and in its second stage als o bleaching. The material falls out of the boilerin a white state and-without any very hard portions, so that it can be manufactured into paper without, having to pass through a lis employeds v I For-the better understanding of the steps V involved-in the, method of carrying out-*onr I process iast'referredtoglet it beassulnedthat' 4 two communicatingfboilers or digesters are employ-ed. 'flhese boilers we willdesignate by the lettersA B in thee'accomp'anying' drawing.

knottingapparatnsa Theboiling process lasts 1 about'fourteen to-eig-hteen' hours; but it may be extended tothirty-six hon-rs when.it-is{de sired to werk with less pressure. If, however,

theprocessi is to be shorten'edwithout weakenin'g the'fiber, the boiling-processwith change F of lyes on-the principle-of the countr'enr'rent 5 It; is-Jals'o' to-be understood thatwe have "at" oommand asupply'oflacid or suiphite solu tionalready employed twice, and that the fresh wood in either boiler is to be first subjected to'the-aetion of this'solutionw Let. it be supposedthat the eontinuousgiro- (sees-has been earried on for sometime, and.

that at one of its stages boiler A contains woodwhichv has been treated with liquid'alr'eady ei'nployed twice, and that boiler B'has-been" filled with' fresh wood. From this'point on the-process continues as follows; First, the J liquid from boiler. A that is to say, the twice -used'-1iqnid+ :is forced into boiler B, while fresh liquid is forced into the boiler, A, steam admitted also, and the boiling effected. At 2 the same time boiling -"is going on-in boiler L with-the liquid which is-now being used for-a :thirdtime: After this latter boiling is coin- .pleted the sulphurousaeita is blowngoff with the steam'from-boiler B in o a condens'ingiapparatns, 0'," and the liqnidsintoa collectingcistern, D',' leaving. only the partiallyedisinte- "grated wood in boiler -B The liquid, from boiler A isnow forced-into boiler "3", and -'is now liqnid'whichhas [been used but once. Boiling new again takes place in boiler B. BoilerA is now emptied and filled with fresh wood. At this point theconditions of the process are reversed -that is to say, boiler B contains wood which has been; treated with liquid already used twice, while boiler A contains fresh .woo'd. Here the operation comboiler to another.

meuces again and continues as before through the courses as above described, boiler E now taking the place of boiler A, and vice verso.

It will be observed that when but two boil crs are employed the liquid is used only three times. If, however, a larger number of boilera are employed, the liquid may be forced from one boiler to another throughout the whole series and used from. four to eight times, thus materially shortening the boiling process and creating a product which cnnnot be pro-- duccd by any other known process. It, however, it is of little consequence whether the fiber obtained is less strong and white then the product of the above-described operation, the interchange of liquid between severe-.1 boilers may be omitted and rotary boilers having lit tle circnmfcrenticl wslocity employed.

Where the pulp is to be manufactured from herd wood, the rotary boilers preferably employed.

We have referred in describing our proceos to the employment of n sulphurous-acid solution, and in this connection we would hnveit understood that while We do not limit ourselves to the use of o. solution of any specific chemical character, we, however, prefer end recommend the use of the double colt ct out phite of calcium magnesium, the conntitntion thereof beingin the proportions of about three atoms of the acid to one of the vbeen. The method of production is described in the op plication of even date herewith.

In describing our process involving the in terchnnge of the solution between two boilers, we have referred to the introduction of steam containing much sulphnrons acid from one By this means we prevent the evolution of the su'lphite of calcium, and are enabled to carry on the continuous operation by causing the stccni contoiningmuch snlphurooo acid to blow oil from one boiler into another.

We are aware tllnt in the nmunfnetoroof paper-pulp from Wood fiber it in not new to subject the wood fiber to the action of sulph urons acid and nulphite solutions in it closed vessel under steeni-presoure under such conditions that the wood has been practically dis integrated and rendered suitable for the mennfecture of paper; but hitherto, so for as we are aware, the sulphitc solutions employed hove consisted of sulphurous acid combined with a single base, and. the-processes here-re sulted in disintegration only, the bleochingoi the fiber being omitted or obtained by e neporote and independent operation. We have discovered that by employing a solution consisting of the sulphurous acid combined with a. double base in certein proportions, and sohjetting the wood to the some according to the solution from one boiler or digester to ani other, so as to subject the wood at different stages of treatment to the action of fresh solu 'tion, whereby the disintegrnting and bleiicll ing is facilitated and the process rendered economical.

Having now described our invention, who, We claim, and desire to secure by Letters Potent, ie-- 1. in the runnoihctnre of cellulose or pnper pulp from. Wood fiber, the process of dicintc' grating and bleaching the fiber in one continnous operation, consisting, essentinlly, in subjecting the fiber to the notion of a double salt solution wherein sulphurons acid is combined with or double loose in the proportions ofebout three atoms of the acid to one atom of the base in 9. closed vessel or boiler to which steezn is admitted, substantially as described,

2. In the manufacture of cellulose or paperpulp from wood fiber by one continuous operation, the process ofdisintegretion and bleaching, which consists in first soaking the wood in n. disintegrotingsolution 'in it closed "vessel, then, prior to heating, forcing in sulphuroue acid until a pressure of at least two otmos- 'phercs is created, then forcing in steam, or

steam mixed with sulphnrous acid, and mainmining-the contents of the boiler at a. tempcmture exceeding that of boiling water, and finally bringing the temperature to a point corresponding to a. stoem pressurc of three to live atmospheres, substantially as described.

3. In the manufacture of cellulose or paperpuip from wood fiber by the action of suiphite solutions, the method of facilitating the disintegration and bleaching operations, which consists in on alternation of the solution between two or more boilers or digesters conmining the fiber under different conditions of treatment, whereby each charge of fresh wood is subjected to the action of a solution already used end next subjected to the notion of fresh solution, subs-itnntiully no described.

In lestimcny that W8 claim the foregoing WtFlIltVEi'llElblllltUEflfi our hands this 28th day ofllovember, 1884.

EUGEI'T BARUH BITTER. CHARLES KELLNER. Witnessmu Anrim VON BARBER, ALBERT VON BARBER. 

